Why do we use |v1| in the formula instead of v1?
- Let's see what happens if we use v1 instead of |v1|:
- Choose a random negative number as the initial value: - 28.
- Choose a random positive number for the end value: 46.
Formula and calculation:
(v1 - v2) / v1 =
(- 28 - 46) / - 28 =
-74 / - 28 ≈
2.642857142857 ≈
2.64
Although the absolute difference is negative: -74, the relative decrease change is positive: 2.64. By using |v1| instead of v1, the error is corrected.
The relative percent decrease change. Detailed calculations below
By multiplying a number by the fraction 100/100,
we change only the form of the result, not the result.
- 100/100 = 100% = 100 ÷ 100 = 1.
- n × 100/100 = (n × 100)/100 = (n × 100)%, any number.
The relative percent decrease change. Formula:
The relative percent decrease change =
The relative decrease change × 100/100 =
(The relative decrease change × 100)/100 =
(The relative decrease change × 100)%
Calculate the relative percent decrease change:
(9,818,200,780 - 7,092,149,401.1)/|9,818,200,780| =
2,726,051,378.9/9,818,200,780 =
2,726,051,378.9 ÷ 9,818,200,780 =
2,726,051,378.9 ÷ 9,818,200,780 × 100/100 =
(2,726,051,378.9 × 100 ÷ 9,818,200,780)/100 =
(272,605,137,890 ÷ 9,818,200,780)/100 ≈
27.765284495435/100 =
27.765284495435% ≈
27.77%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 9,818,200,780 to the final, end value 7,092,149,401.1:
Rounded off to max. 12 decimal places ≈ 27.765284495435%
Rounded off to max. 2 decimal places ≈ 27.77%
The absolute (actual) difference
9,818,200,780 - 7,092,149,401.1 = 2,726,051,378.9
By what percentage has 9,818,200,780 decreased?
Answer: By ≈ 27.77%
By what percentage is 7,092,149,401.1 smaller than 9,818,200,780?
Answer: By ≈ 27.77%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).